This article uses corpus methods to examine linguistic expressions of stance in over 4,000 argumentative essays written by incoming first-year university students in comparison with the writing of upper-level undergraduate students and published academics. The findings reveal linguistic stance markers shared across the first-year essays despite differences in students' educational context, with greatest distinctions emerging between first-year writers and all of the more advance writers. The specific features of stance that point to a developmental trajectory are approximative hedges/boosters, code glosses, and adversative/contrast connectors. The findings suggest methodological and conceptual implications: They highlight the value of descriptive, corpus-based studies of incoming first-year writing compared to advanced academic writing, and they underscore the construction of academic stance--particularly via certain stance features--as a process of delimiting one's stance in a way that accounts for the views of others.